LAMPREYS/HAGFISHES
ANIMALS/VERTEBRATES
2017-03-15 13:39:26.0 [mgenazzi] Definition updated update Definition (Fish are, broadly speaking, any poikilothermic (or organism whose body temperature varies according to the temperature of its surroundings) legless, aquatic vertebrate that possesses a series of gills on each side of the ;pharynx, a two-chambered heart, no internal nostrils, and at least a median fin as well as a tail fin.); update Definition (Allaby, M. 1998. A Dictionary of Ecology. Oxford University Press. Oxford, New York. );
FISH
Fish are, broadly speaking, any poikilothermic (or organism whose body temperature varies according to the temperature of its surroundings) legless, aquatic vertebrate that possesses a series of gills on each side of the ;pharynx, a two-chambered heart, no internal nostrils, and at least a median fin as well as a tail fin.
SHARKS/RAYS/CHIMAERAS
RAY-FINNED FISHES